<![CDATA[Medicine, vaccine, and chemical (OVK) products are the first line of defence for maintaining the health and productivity of independent layer-chicken enterprises, yet smallholder farmers frequently struggle to manage costs and to choose appropriate products because of limited information. This study analysed the simultaneous and partial effects of capital, farming duration, and senior-farmer recommendation on the decision to select OVK products, and identified the most dominant factor among independent layer farmers in Bandar District, Batang Regency, Central Java. A survey was conducted using purposive sampling of 40 independent farmers keeping at least 1,000 birds. Data were collected through structured Likert-scale interviews, observation, and documentation, and analysed by multiple linear regression using IBM SPSS after validity, reliability, and classical assumption testing. The instrument was valid (r = 0.516–0.791 > 0.263) and reliable (Cronbach's alpha = 0.723–0.830), and the model satisfied the normality, multicollinearity, and heteroscedasticity assumptions. Simultaneously, the three factors had a positive and significant effect on the OVK-selection decision (F = 55.603; P < 0.05), explaining 63.2% of its variation (adjusted R-squared = 0.632). Partially, all three were significant: capital (t = 3.367), farming duration (t = 4.473), and senior-farmer recommendation (t = 4.865), the last being the most dominant. The findings indicate that peer recommendation and accumulated experience outweigh purchasing power in shaping farmers' OVK choices, which has clear implications for extension, distribution and responsible product use.]]>
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